Positioning structure and method for assembling compressor

ABSTRACT

A positioning structure and a method are used to assemble a scroll compressor for outputting high-pressure fluid. The casing, supporting stage and the upper scroll are arranged and positioned by using pin engaged with pin hole. The lower scroll is provided on a baffle face of the supporting stage. A transmission shaft is pivotally arranged on the supporting stage with one end connected to a rotation power source. The transmission shaft comprises a crank at top thereof and is connected to bottom of the lower scroll such that the axis of the upper scroll is coaxial with the transmission shaft of the lower scroll. Moreover, the upper scroll and the lower scroll have relative acentric rotation to generate high-pressure fluid.

BACKGROUND OF THE INVENTION

The present invention relates to a positioning structure and a methodfor assembling compressor, and more particularly to a positioningstructure for achieving the coaxial arrangement of compressor componentsand a method for assembling compressor.

The positioning device and method for assembling a prior art scrollcompressor demand to assemble the elements of the scroll compressor incoaxial manner. However, in this kind of scroll compressor, the axis ofthe upper scroll and the transmission axis of the lower scroll should becoaxial. Therefore, the inner diameter of compressor casing, the outerdiameters of the upper scroll and the lower scroll should be matchedwithin certain tolerance for coaxial positioning. However, this requiresprecise size match for those elements. The work area is large and thecost is increased.

SUMMARY OF THE INVENTION

The present invention provides a positioning structure for achieving thecoaxial arrangement of compressor components and a method for assemblingthe compressor.

Accordingly, the positioning structure of the present invention includesa casing, a supporting stage in the casing, an upper scroll and a lowerscroll being fixed to the supporting stage to achieve generation ofhigh-pressure fluid. A pin is extended from the supporting stage and athrough pin hole is defined in the upper scroll and corresponding to thepin. The pin hole is engaged with the pin to assemble the upper scrollto the supporting stage. An axial hole is defined in the supportingstage and a transmission shaft on bottom of the lower scroll passesthrough the axial hole of he supporting stage and the axial hole of thelower shell for connecting to a motor. The motor drives the lower scrollto rotate while the axis of the upper scroll is coaxial with thetransmission shaft of the lower scroll.

BRIEF DESCRIPTION OF DRAWING

The features of the invention believed to be novel are set forth withparticularity in the appended claims. The invention itself however maybe best understood by reference to the following detailed description ofthe invention, which describes certain exemplary embodiments of theinvention, taken in conjunction with the accompanying drawings in which:

FIG. 1 shows a sectional view of the positioning structure of acompressor according to a preferred embodiment of the present invention.

FIG. 2 shows a sectional view of the positioning structure of compressoraccording to another preferred embodiment of the present invention.

FIG. 3 is a sectional view showing the pin used in the positioningstructure of compressor according to the present invention.

FIG. 4 shows a flowchart of the assembling method for the compressoraccording to the present invention.

DETAILED DESCRIPTION OF THE INVENTION

FIG. 1 shows a sectional view of the positioning structure of acompressor according to a preferred embodiment of the present invention.The scroll compressor 10 comprises a casing 11 with a supporting stage13 therein, an upper scroll 15, a lower scroll 17 and a transmissionaxis 19. The lower scroll 17 is placed on the supporting stage 13 andthe transmission axis 19 is pivotally connected to the supporting stage13 with one end connected to a rotation means. A crank 191 is formed ontop of the transmission axis 19 and pivotally connected to a sleeve onbottom of the lower scroll 17. The crank 191 drives the lower scroll 17to have acentric rotation with the upper scroll 15, thus producinghigh-pressure liquid.

The supporting stage 13 comprises an axial hole 131 and the casing 11comprises a lower shell 111 with an axial hole 192. The supporting stage13 is retained on the lower shell 111. The transmission axis 19 ispivotally connected to the axial hole 131 of the supporting stage 13 andthe axial hole 192 of the lower shell 111 to determine a rotation axisthereof. One end of the transmission axis 19 is connected to a motor193. The transmission axis 19 is driven by the motor 193 to rotate thelower scroll 17. The supporting stage 13 comprises a first pin hole 132and the lower shell 111 comprises a second pin hole 112. A pin 20 passesthrough the first pin hole 132 and the second pin hole 112 to limit arelated position between the axial hole 13 of the supporting stage 13and the motor 193 on one end of the transmission axis 19, thuspositioning the axis of the transmission axis 19.

The supporting stage 13 comprises at least two first pin holes 132 andthe lower shell 111 comprises corresponding second pin holes 112. Thepins 20 pass through the first pin holes 132 and the second pin holes112 to limit three degree of freedom for the supporting stage 13 and thelower shell 111 on a plane, thus achieving better precision.

In above-mentioned assembling structure for the supporting stage 13 andthe lower shell 111, only the first pin holes 132 of the supportingstage 13 and the second pin holes 112 of the lower shell and the pins 20need machining and positioning with high precision. The supporting stage13 and the lower shell 111 can be precisely assembled.

The upper scroll 15 is assembled in the casing 11 to form a liquidcompression mechanism with the lower scroll 17. The upper scroll 15comprises a third pin hole 153 used with a fourth pin hole 133 of thesupporting stage 13. A pin 21 passes through the third pin hole 153 andthe fourth pin hole 133 to limit a coaxial structure composed of theupper scroll 15 and the supporting stage 13 pivotally connected to thetransmission axis 19.

The upper scroll 15 might comprise at least two third pin hole 153 andthe supporting stage 13 also comprises corresponding fourth pin holes133.

Similarly the upper scroll 15 might comprise at least two third pin hole153 and the supporting stage 13 also comprise corresponding fourth pinholes 133. The corresponding pins 21 pass through the third pin hole 153and the fourth pin holes 133 to limit three degree of freedom for thesupporting stage 13 and the upper scroll 15 on a plane, thus achievingbetter precision.

The upper scroll 15 is assembled to the supporting stage 13 by passingthe pins 21 through the third pin hole 153 and the fourth pin holes 133,thus assembling the upper scroll 15 to the casing 11. The pins 21 onlylimit the degree of freedom for the upper scroll 15 on a plane and donot limit the degree of freedom along a vertical direction.

In the above-mentioned casing 11 or supporting stage 13, at leastportion thereof is made by casting such that portion of the casing 11and the supporting stage 13 is made by casting. Moreover the casing 11and the supporting stage 13 can also be integrally formed by casting.

FIG. 2 shows a sectional view of the positioning structure of compressoraccording to another preferred embodiment of the present invention.

With reference to FIG. 2, the positioning structure of compressoraccording to the present invention comprises a plurality of first pinholes 132 on the supporting stage 13, a plurality of second pin holes112 on the lower shell 111 and a plurality of third pin holes 153 on theupper scroll 15. Those pin holes are corresponding to each other to forma plurality of through holes. A plurality of pins 22 passes throughcorresponding through holes such that the supporting stage 13 and theupper scroll 15 can be simultaneously assembled with the casing 11 andthe upper scroll 15 is coaxial with the transmission axis 19.

FIG. 3 is a sectional view showing the pin used in the positioningstructure of compressor according to the present invention.

With reference to FIG. 3, the pins include pin 20, pin 21 and pin 22.Taking the pin 21 as an example, the pin 21 comprises a rod-shaped body,flange 21 a at top side thereof, and a thread 21 b at bottom sidethereof. The supporting stage 13 comprises a thread hole 134 forengaging the thread 21 b such that the pin 21 is engaged with the threadhole 134 of the fourth pin holes 133, after passing the third pin holes153 of the upper scroll 15. Moreover, the flange 21 a provides upperlimit for the position of the upper scroll 15.

FIG. 4 shows a flowchart of the assembling method for the compressoraccording to the present invention. This method is applied to a scrollcompressor 10 and uses assembling structure for retaining the supportingstage 13 to the upper scroll 15 and the lower scroll 17 and forassembling the scroll compressor 10. The method comprises a step 100 forfixing the supporting stage 13 to a predetermined position of the casing11 of the scroll compressor 10, which provides a reference forsuccessive steps. In the step 200, the transmission axis 19 of the lowerscroll 17 is inserted into the axial hole 131 of the supporting stage 13and the axial hole 192 of the lower shell 111 and connected to a motor193 for providing power. Therefore, the transmission axis 19 can bepositioned by the axial hole 131 and the axial hole 192. In the step300, corresponding pin 21 is inserted into the third pin holes 153 ofthe upper scroll 15 and the fourth pin holes 133 of the supporting stage13 for clamping. Therefore, the upper scroll 15 and the transmissionaxis 19 can be clamped by above steps.

Moreover, the supporting stage 13 can be integrally formed with thecasing 1 to enhance the positioning precision of the supporting stage 13and prevent calibration problem after assembling.

Although the present invention has been described with reference to thepreferred embodiment thereof, it will be understood that the inventionis not limited to the details thereof. Various substitutions andmodifications have suggested in the foregoing description, and otherwill occur to those of ordinary skill in the art. Therefore, all suchsubstitutions and modifications are intended to be embraced within thescope of the invention as defined in the appended claims.

1. A positioning structure for a compressor, the compressor comprising acasing for mounting a supporting stage, an upper scroll, a lower scrolland a transmission shaft, the transmission shaft pivotally connected toan axial hole of the supporting stage and an axial hole on bottom of thecasing and having one end connected to a rotation power source andhaving another end connected to a bottom of the lower scroll for drivingthe upper scroll and the lower scroll to have relative acentric rotationand generating high-pressure fluid, the positioning structure beingcharacterized in that the supporting stage is fixed to a lower shell ofthe casing and the supporting stage comprises at least one pin hole, theupper scroll comprises at least one corresponding pin hole, a pin isinserted into the pin hole of the supporting stage and the pin hole ofthe upper scroll to limit a relative position between the upper scrolland the supporting stage.
 2. The positioning structure for a compressoras in claim 1, wherein the pin is inserted into the pin hole of thesupporting stage and the pin hole of the upper scroll to limit a radialdegree of freedom for the upper scroll.
 3. The positioning structure fora compressor as in claim 1, wherein at least part of the casing and thesupporting stage is made by casting such that portion of the casing andthe supporting stage is made by casting.
 4. The positioning structurefor a compressor as in claim 1, wherein the casing and the supportingstage are integrally formed.
 5. The positioning structure for acompressor as in claim 1, wherein the pin comprises a rod-shaped body, aflange at top side thereof, and a thread at bottom side thereof, thethread passing through the pin hole of the supporting stage and the pinhole of the upper scroll such that the pin is retained to the pin holeof the supporting stage.
 6. The positioning structure for a compressoras in claim 5, wherein the pin passes through the upper scroll and thesupporting stage and selectively fixed to the casing and the supportingstage.
 7. A positioning structure for a compressor, the compressorcomprising a casing for mounting a supporting stage, an upper scroll, alower scroll and a transmission shaft, the transmission shaft pivotallyconnected to an axial hole of the supporting stage and an axial hole onbottom of the casing and having one end connected to a rotation powersource and having another end connected to a bottom of the lower scrollfor driving the upper scroll and the lower scroll to have relativeacentric rotation and generating high-pressure fluid, the positioningstructure being characterized in that the casing comprises a lower shellon bottom thereof and the lower shell comprises an axial hole, thesupporting stage is fixed to the lower shell of the casing; thesupporting stage comprises at least one pin hole, the lower shellcomprises at least one corresponding pin hole, a pin is inserted intothe pin hole of the supporting stage and the pin hole of the lower shellto limit a relative position between the axial hole of the supportingstage, which is pivotally connected to the transmission axis, and theaxial hole of the lower scroll, whereby an axis of the transmission axiscan be positioned.
 8. The positioning structure for a compressor as inclaim 7, wherein the pin is inserted into the pin hole of the supportingstage and the pin hole of the casing to limit a radial degree of freedomfor the supporting stage.
 9. The positioning structure for a compressoras in claim 7, wherein at least part of the casing and the supportingstage is made by casting such that portion of the casing and thesupporting stage is made by casting.
 10. The positioning structure for acompressor as in claim 7, wherein the casing and the supporting stageare integrally formed.
 11. The positioning structure for a compressor asin claim 7, wherein the pin comprises a rod-shaped body, a flange at topside thereof, and a thread at bottom side thereof, the thread passingthrough the pin hole of the supporting stage and the pin hole of thelower scroll such that the pin is retained to the pin hole of the lowerscroll.
 12. The positioning structure for a compressor as in claim 11,wherein the pin passes through the casing, and the supporting stage andselectively fixed to the casing and the supporting stage.
 13. A methodfor assembling a compressor, the compressor comprising a casing, asupporting stage in the casing, an upper scroll and a lower scroll beingfixed to the supporting stage to achieve generation of high-pressurefluid, the method comprising the steps of: fixing the supporting stageto a predetermined position in the casing of the compressor and thesupporting stage providing a position reference for successiveassembling; inserting one end of a transmission shaft of the lowerscroll to an axial hole of a lower shell, another end of thetransmission shaft passing an axial hole in the supporting stage suchthat both ends of the transmission shaft are retained by the two axialholes; and inserting at least one pin into corresponding pin hole suchthat the upper scroll and the transmission shaft are coaxiallypositioned.
 14. The method for assembling a compressor as in claim 13,wherein the step of inserting at least one pin into corresponding pinhole comprising: aligning a pin hole of the upper scroll to a pin of thesupporting stage, inserting the pin into the pin hole of the upperscroll to position the upper scroll and the supporting stage.
 15. Themethod for assembling a compressor as in claim 13, wherein the step ofinserting at least one pin into corresponding pin hole comprising:aligning a pin hole of the casing to a pin of the supporting stage,inserting the pin into the pin hole of the upper scroll to position theupper scroll and the supporting stage.